Starting device for non-self-starting phonograph motors



Aug, 9, 949 H, C. VAN DOQRN 4789343 STARTING PHONOGRAPH MOTORS STARTINGDEVICE FOR NONSELF Filed July 5, 1946 Patented Aug. 9, 1949STARTING-DEVICE FOR NON-SELF-START- ING PHONOGRAPH MOTGRS HermanCornelis Van Doorn, lands, assignor to Hartford Trust Company, Hartford,

Application July 3, 194.

Ingthe Netherland Section 1, Public La Patent expire Eindhoven, Nether-National Bank and C onn., astrustee 6, Serial No. 681,393 s August 4,1943.

w 690, August 8.19462 s August 4, 1963 Though non-sel'f-starting motors,for instance synchronous motors in phonograph installations, haveadvantages over-the other usual types, since they operate at a constantspeed without special precautions and, particularly since theirmanufacture is much cheaper, theyfnaturally have inherent therein thedrawback that they cannot start automatically. For; instance, theturntable has tobeset in motion initially-either directly by hand or bymeans of-V a special mechanism when starting operation ofthe phonograph.

Start-ingA devices for' synchronous motors are known. These may comprisea spring which is first stretched and whose energy is then released fordriving the mechanism, by means of, which the turntabler is set inmotion andthe electric circuit of the motor` is completed. The spring isstretched by means of an arm, which is moved by hand andi is-loc'kedautomatically, for instance by means of a pawl, at the end offthestroke. Only after thisbperation is; the phonograph` ready for use.The phonograph is started up by pressing a knob, as a result of whichthe aforesaid arm and the spring connected thereto are released. Owingtothe aforesaid release of the spring, the mechanism and finallyv themotor are set into motion. After that, th 'groove-scanner'has to beplaced on the` record.

The present'invention concerns asimilar starting device but has for itspurpose the simplificat'on of the operations for starting`f up themotor. According to the invention, this is achieved by carrying out therequired operations exclusively by means of the arm of the groovescanner.

The device according to the invention is preferably designed in such amanner that the stretching and release of the said spring takes place byone outward displacement of the groove scanner. In this case theoperation of the phonograph takes place similarly to the commonautomatic talking machines having self-starting motors, in whch thescanner is slightly turned outwards to start up the motor. In thisrespect the use of a synchronous motor outwardly corresponds entirely tothat of a self-starting motor.

In order that the invention may be clearly understood and readilycarried into eect, it will now be explained more fully with reference tothe accompanying drawing, given by way of example and representing oneembodiment thereof.

The sole figure represents a starting device according to the inventionand according to the last-mentioned executional example. When the arm ofthe groove scanner I is moved outwards and is thus turned on the base 2in the direction ofthe arrow 3 which The toothed segment k5 is -looselymovable about the shaft 3. The pawl 6, however, engages the ratchetkwheel 4v and is mounted on the segment 5 at the centre ofrotalrion 'I,so, that the notyet engage the segment 5, as long as the rubber drivingwheel l5 which is rigidly secured to the pinion mediary of the shaft I4;stands free from the turntable. v'Line-said engagement only takes placewhen the pin I0,V which is mounted on the segment 5, abuts aga-inst' thecam IiI. As a result thereofY a small displacement of the lever I2; inwhich isv journalledthe. shaft I4V with the pinion 9 and the wheel I5;allows the,4 drawspring, I6,l to turn the lever Ii.'` over` suc pushedvagainst the turntable. VUpon this engagement a further vsmall` angulardisplacement of segment 5 results in that ther `pawl abuts against thepinA I I at 6a, Qwing, to this the pawl is moved away from theA ratchetWheel` and remains in this position under the action. of the platespring 8- which permits a permanent active and inactive position of' thepawl., The plate spring 8; in effect, is secured with a pin 8a to thesegment and has such a length that both in the active and in theinactive position no couple is exerted on the pawl in contradistinctionto all intermediate positions.

After the segment 5 has been disengaged from the ratchet wheel 4, thedraw spring I8 becomes -operative and withdraws the segment in adirection opposite to that of the arrow. This results in that the pinion9 is made to rotate which in its turn drives the wheel I5 engaging theturntable I9, so that the turntable I9 is made to rotate in thedirection of the arrow B. At the end of the stroke the returning segment5 disengages the pinion 9, through the intermediary of the pin 2li whichabuts against the cam II and at the same time the contact between thewheel I5 and the turntable I 9 is removed. A suitable stop (notrepresented) provides that the lever I2 cannot be moved back too far bythe spring I6. Upon abutment of the pin 2l) against the cam II a furtherangular displacement of the segment results in that the xed pin 2Iengages the side 6b of the phonograph comprising tric motor, a turntableoperatively connected thereto, a grooveV scanner arm operativelyassociated with said turntable, first means for set- Vtingrsaidnon-self-starting electric motor in mopawl 6, so that the pawl is madeto engage the ratchet wheel 4 again. At the same time the contactsprings 22 and 23 are interconnected through a locking member 24 whichis secured on a block of insulating material to the segment 5. Thisresults in that the main voltage is applied to the motor which is nowcapable of continuing the driving of the mechanically started turntable.

What I claim is:

1. A starting device for a non-seli-starting phonograph comprising anon-self-starting electric motor, a turntable operatively connectedthereto, a groove scanner arm operatively associated with saidturntable, means for setting said non-self-starting electric motor inmotion, and other means for initiating operation of said iirst means,said other means being mechanically linked to and positively actuated bymanual movement of said groove scanner arm.

2. A starting device for a nonself-starting a non-self-startingVelection, second means for initiating operation of said iirst means,said second means being mechanically linked to and positively actuatedby manual movement of said groove scanner arm,

randswitch means for said non-self-starting electric motor which areclosed by manual movement `of said groove scanner ar 3. A startingldevice for a non-self-starting `phonograph comprising anon-self-starting electric motor, "a turntable operatively connectedthereto, a groove scanner arm operatively associated with saidturntable, spring means for set- ',ting said non-lself-starting electricmotor in motion, pawl and ratchet means for placing tension onsaidspring means, said pawl and ratchet means being mechanically linkedto and positively actuated by manual movement of said groove scannerarm, abutment means for rendering said pawl and ratchet meansinoperative, and switch means for said non-self-starting electric.motorwhich are closed by manual movement of said groove scanner arm.

4. AY starting device for a non-self-starting -phonograph comprising anon-self-starting electricrmotor, .a turntable operatively connectedthereto, a groove scanner arm mounted on a rod as a pivot to permitoperative association with said turntable, Va ratchet wheel fixedlymounted on said rod, a, plate segment mounted for pivotal movement andhaving gear teeth at the circumferential edge thereof, a pawl movablymounted on said plate segment;v and operatively associated with saidratchet wheel, a pivotal mounting, a pinion thereon, a wheel operativelyassociated with said pinion, said pivotal mounting movable to a firstposition wherein said pinion is in engagement with said gear teeth andsaid wheel is in engagement with said turntable and movable to a secondposition wherein said pinion is out of engagement with said gear teethand said wheel is out of engagement with said turntable.

5. A starting device for a non-self-starting phonograph as in claim 4wherein abutment means are provided on said plate segment for engagingsaid pivotal mounting whereby said pivotal mounting is moved to said rstposition in one position of said'plate segment and to said secondposition in another position ofsaid plate segment, stop means areprovided which are operatively associated with said pawl mounted on saidplate segment for moving said pawl into operative engagement with saidratchet in said another position of said plate segment and out ofoperative engagement with said ratchet in said one position of saidplate segment, switch means for said non-self-starting motor areprovided on said plate segment, said switch means being closed when saidsegment is in said another position, and spring means are provided forbiasing said plate segment to said another position.

HERMAN CORNELIS VAN DOORN.

REFERENCES CITED The following references are otrecord in the le of thispatent:

UNITED STATES PATENTS Number Name Date 1,136,739 Tiffany Apr. 20, 19151,238,168 McNulty Aug. 28, 1917 1,415,270 Smith May 9, 1922 1,665,890Michl Apr. 10, 1928 1,667,794 Michl May l, 1928 FOREIGN PATENTS NumberCountry Date 397,877 Great Britain Sept. 1, 1933 426,65() Great BritainApr. 8, 1935

